Achievements
Complete each achievement to receive the allotted gamerscore:

'Til It Goes Click (5) - Kill 3 enemies in a row with the Machine Gun without reloading.
32 Pieces of Flair (15) - Earn each Badge in ranked matches.
A Thorne in their Side (10) - Complete the Stormfront level of the Campaign.
Basic Training (5) - Complete the Answers level of the Campaign.
Exterminator (10) - Win a game on each map in Swarm on Hard or Insane difficulty.
Falling with Style (10) - Kill an enemy by dropping on them.
Get to da Choppa (10) - Survive against the Elimination DCM.
Battle-Hardened (15) - Complete the Campaign on Hard difficulty.
Citronella Armor (15) - Win a complete game of Swarm without dying on Medium or harder difficulty.
Dig Two Graves (5) - Complete the Beasts level of the Campaign.
Duck Hunt (5) - Kill 10 enemies with the Deployable AA Turret.
I'm the Juggernaut... (5) - Kill an enemy by colliding with them while Overdriving.
Mission Accomplished 2.0 (10) - Complete the Campaign on any difficulty.
Mission Possible (15) - Participate in each DCM successfully in ranked matches.
Knife to Meet You (5) - Fatality an enemy with the Knife.
Like a Boss (15) - Reach level 50 in ranked matches.
Loud Cartographer (10) - Win a ranked match in each map group in Conquest.
Money in the Banana Stand (15) - Purchase every Vehicle and Deployable.
Spice of Life (10) - Kill an enemy with each weapon type.
Use More Gun (10) - Defeat the Vehicle Engineer in the Prejudice level of the Campaign before he deploys a Mech.

Additionally, there are three Overdrive DLC achievements:

Lord of Avernus (10) - Win a ranked match on Abaddon.
Ball Hog (20) - Capture 20 Control Points in Assault.
I Feel Like Lightning (20) - Hack a Control Point within 30 seconds in Assault.